output electric current of a PV device as a function of output voltage, at a particular temperature and irradiance

NOTE 1 IEC/ISO rules stipulate that the symbol for voltage is "U", whereas the many industries engaging with electricity use the symbol "V". In keeping with normal convention, the PV industry also uses "V" and thus the symbol "I-V" to describe the current-voltage characteristic

NOTE 2 Sometimes the industry uses "IV" as the symbol. The use of "I-V" is less ambiguous than "IV", which also means "four" in roman numbering